March 2008
Intermediate to advanced
604 pages
18h 38m
English
Content preview from Programming Amazon Web ServicesBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Interacting with EC2
Query API
The EC2 web service API is made available through two interfaces, Query and SOAP. In this book we will use the Query interface.
The EC2 service implementation presented in this chapter uses
the Query API functionality implemented in the Amazon Web Services
(AWS) Ruby module. The AWS module
includes methods that perform authentication, transmission, and
response checking of Query API requests. These methods are presented
in Query API Implementation” in Chapter 2.
Amazon uses version identifiers to label different
versions of their Query APIs. By assigning each API version its own
identifier, Amazon can continue to develop and change the APIs without
breaking client implementations that use the older versions. In this
book, we used the most current EC2 API version available: 2007-08-29.
EC2 Implementation Stub
In this chapter we will gradually build up a complete
implementation class called EC2
that you can use to interact with the EC2 service. Example 5-1 defines a basic Ruby code stub that defines
the EC2 class, to which we will add
API implementation methods as we proceed through the chapter. Save
this code to a file named EC2.rb
in the same directory as the AWS
module file AWS.rb, defined in
Chapter 2.
Example 5-1. EC2 class stub: EC2.rb
require 'AWS' class EC2 include AWS # Include the AWS module as a mixin ENDPOINT_URI = URI.parse("https://ec2.amazonaws.com/") API_VERSION = '2007-08-29' SIGNATURE_VERSION = '1' HTTP_METHOD = 'POST' # 'GET' # EC2 API implementation ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.